linux-kernel - [tip:perf/core] perf: Use POLLIN instead of POLL

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Date:	Wed, 4 Feb 2015 06:40:13 -0800
From:	tip-bot for Jiri Olsa <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, mingo@...nel.org,
	namhyung@...nel.org, hpa@...or.com, peterz@...radead.org,
	fweisbec@...il.com, linux-kernel@...r.kernel.org, acme@...nel.org,
	tglx@...utronix.de, jolsa@...nel.org, eranian@...gle.com
Subject: [tip:perf/core] perf:
  Use POLLIN instead of POLL_IN for perf poll data in flag

Commit-ID:  7c60fc0e022858e19c66289ec65cc3effc8c0b1f
Gitweb:     http://git.kernel.org/tip/7c60fc0e022858e19c66289ec65cc3effc8c0b1f
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Wed, 28 Jan 2015 18:54:38 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 4 Feb 2015 08:07:13 +0100

perf: Use POLLIN instead of POLL_IN for perf poll data in flag

Currently we flag available data (via poll syscall) on perf fd with
POLL_IN macro, which is normally used for SIGIO interface.

We've been lucky, because POLLIN (0x1) is subset of POLL_IN (0x20001)
and sys_poll (do_pollfd function) cut the extra bit out (0x20000).

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/1422467678-22341-1-git-send-email-jolsa@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/ring_buffer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index 146a579..eadb95c 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -13,12 +13,13 @@
 #include <linux/vmalloc.h>
 #include <linux/slab.h>
 #include <linux/circ_buf.h>
+#include <linux/poll.h>
 
 #include "internal.h"
 
 static void perf_output_wakeup(struct perf_output_handle *handle)
 {
-	atomic_set(&handle->rb->poll, POLL_IN);
+	atomic_set(&handle->rb->poll, POLLIN);
 
 	handle->event->pending_wakeup = 1;
 	irq_work_queue(&handle->event->pending);
--
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